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SiC-Si 3N4 Gradient Composite Ceramics by Special Hip Processing

  • Jiang Dongliang
  • She Jihong
  • Tan Shouhong
  • Guo Jingkun
  • Peter Greil
Chapter

Abstract

α-SiC fine powder clad with special glass were sintered by HIP processing under 200 MPa at 1800 °DC. The density of material obtained is close to 97.5% of theoretical density, bending strength reached 582 MPa, which is about 50% higher than that of common pressureless sintered silicon carbide. After post-HIP treatment, density can be further increased to above 98.5% of theoretical density. The material with different composition can also be got in various atmospheres. According to thermodynamic calculation, SiC can be transformed into Si3N4 under optimum temperature and high N2-pressure. Experimental work was successful in fabricating SiC-Si3N4 gradient composite material. This kind of new SiC-Si3N4 gradient composite material were also identified by X-ray diffraction analysis. The strength and fracture toughness of this material is 900± 100 MPa and 8.4 MPa.m 1/2 respectively, which are about one times higher than those of hot-pressed SiC material. This study offered a new HIP processing technology for preparing high performance SiC-Si3N4 gradient composite ceramics directly from pure SiC powder.

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Copyright information

© Elsevier Science Publishers Ltd and MPA Stuttgart 1992

Authors and Affiliations

  • Jiang Dongliang
    • 1
  • She Jihong
    • 1
  • Tan Shouhong
    • 1
  • Guo Jingkun
    • 1
  • Peter Greil
    • 2
  1. 1.Shanghai Institute of CeramicsAcademia SinicaChina
  2. 2.Technische Universitat Hamburg-Harburg(TUH)FRG

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